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FREQUENC
Y
MEASUREMENTS
Range:
0
to
50 MHz (dc
input).
25
Hzto
50 MHz
(ac
input, maximum sensitivity).
Gate
Time:
l
prsec
to
l0seconds indecade
steps.
Accuracy: r
1 count
r
time
base accuracy
Reads
In:
kllz
or
MHz
with positioned decimal
point; units
annunciator
in
line with digital
display.
Self
Check:
counts 10 MHz
for
the
gate time
chosen
by the
time
base
selector switch.
SCALING
Frequency
Range:
0
to
50
MHz.
Factor:
by
decades up
to 109, switch
selected
on
rear
panel.
Input:
front panel,
Signal
Input.
Output: in
place
of
time
base
output
f
requencies.
PE
RIOD
AVERAGE
MEASUREMENTS
Range: Single
Period
0
to
1
MHz
Multiple
Period
0
to
300 kHz
Periods Averaged:
1
period
to
105
periods in
decade steps.
Accuracy: t 1
count
t
time
base accuracy
r
trigger error.
*
Frequency
Counted:
1 and
10
period lKz
to
10
MHz indecade
steps
100
period
.
10
Hz
to
10
MHz
1,
000
period.
100
Hz
to
10
MHz
10, 000
period
1
kHz
to
10 MHz
100, 000
period
10 t<IIz
to
10 MHz
Reads
In:
sec, ms, ps, with positioned decimal
point; units
annunciator
in
line with
digitaf
display.
SeIf
Check:
Gate
time
is
10ps to1
sec
(periods
averagedof
100
kHz);
counts
100
kHzfromthe
time
base.
RATIO
MEASUREMENTS
Displays: (ft/tZ) times
period multiplier.
Range: f1
- 0
to 50
MHz.
fZ
- 0 to
1
MHz
in
single
period.
0
to
300
kHz
in multiple period;
periodi
averaged
1
to
105
in
decade
steps.
Sensltivity:
0.
1
v
rms,
each input.
xTrigger
erroris
less
than
+0.370of
oneperiod
;
periods
averaged
for
signals rvith40db
or
better
signal-to-noise
ratio.
r* After
72
hours of continuous operation.
Accuracy:
+
1
count
9f f1
r
trigger error*
of
fr.
f1
is
frequency applied
to
the
decimal
countels
(enters Time
Base
Ext.
jack
on
front
panel);
f.2
is
frequency applied
to
decade
dividers
(enters Signal Input jack).
Reads
In:
Dimensionless; positioned decimal
point
for
number
of periods
averaged.
SeIf
Check: Period Average Setf Check applies.
TIME
BASE
Frequency
(internal):
1
MHz.
Stability:
Aging Rate
- less
than
3
parts
in
109
per
24
hours. r*
As
a Fupction of Temperature:
lessthan
12
parts in 1010/'C -20'C to
+55"C"
As a Function of Line
Voltage:
Iess than
+
5
parts in
1010
for
+!\Vs
change
in line
voltage
from
115v
or
230
v rms.
Short
Term
-
less than
2
parts in
1010
,*,
withmeasurement averaging
timeof
one
sec-
ond under constant
environmental and line
voltage conditions.
Adjustment:
Fine frequency adjustment
(range
approximatety
4
parts
in
108) and
medium
frequency a{justment (range approximately
1 part
in
10o)
are available from the front
panel through the plug-in
hole.
Coarse
fre-
quencJ
adjustment
(range
approximately
1
part
in
100)
is
available at the
rear
of the
instru-
ment.
Output Frequencies:
Rear
Panel:
0.
1 Hz
to
10 MHz
in
decade
steps; switch selected on
rear
panel;
all fre-
quencies
available in manual function without
interruption at reset
except
100
Hz,
l0 Hz,
1
Hz,
and
0"
I Hz
which
are
interrupted by
manual
reset;
10 kHz
to
10
MHz
available
continuously
in a1l functions;
1
kHz
available
continuously
for all
functions except
100K
period average;
stability
same as
internal time
base;
5
volts p-p rectangular
wave
with
1000
ohm source impedance
at
1
MHz
and
lower;
1
volt
rms
sine
wavewith
1000
ohm source
im-
pedance
only
at
10
MHz.
Front Panel:
0.1H2
to
l
MHz
in
decade steps;
selected
by Time Base switch; availability
as
defined under Output Frequencies
above; sta-
bility
same as
internal time
base;
I
v
p-to-p.
External Standard
Frequency:
1
MHz,
1
volt,
rms,
into
1000
ohms required at rear
panel
BNC connector.
GENERAL
Registrqtion: 8 digits in-line with
rectangular
NixieQ tubes
and
display storage;
99,999,
999
maximum display; total
width
of
B
digit display
including illuminated units annunciator
and
auto-positioned
decimal point indication
does
not
exceed ? inches.
Section
I
Table
1-1
Model 5245L
Table
1-1.
Specifications
r-2
02349-1
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